I actually have a 20-amp Astron, as well as a 20-amp Icom supply, but I was hoping for something in the middle. If I were just going to consider using only the KX3 i suppose a 6-7 Amp supply would do the trick, and I would think it might be no bigger than the KX3 itself, no?
Bill WK6A Sent from my iPhone On Sep 18, 2012, at 2:16 PM, Don Wilhelm <w3...@embarqmail.com> wrote: > Bill, > > I would suggest an Astron 20 amp supply (or even the 35 amp linear). Yes, it > is overkill for the 12 watt KX3, but that is no problem, the current will not > exceed what the connected device (the KX3) needs even though the supply is > capable of much more current. When you also have the KXPA3, you will need > that extra current. You also have other 12 volt powered devices around the > shack, so the extra current rating will help with powering those devices. > > For those who want to homebrew for the basic KX3, I suggest you look at the > article in QST from November 1993 page 27 for a 5 amp regulated 13.8 volt 5 > amp power supply with crowbar overvoltage protection. We are hams, so think > "build your own" It is a good philisophy/ > > 73, > Don W3FPR > > On 9/18/2012 4:53 PM, Bill Tubbs wrote: >> After sending my note about using the little MFJ power supply at 2.89 amps, >> I realized that it works fine on my FT-817D at 5 watts but would obviously >> be taxed at the full 12 watts of the KX3. So fuggetabowdit. >> >> Now I'M looking for a sufficient supply for the KX3 ;-) >> >> Bill >> WK6A >> >> Sent from my iPhone >> >> On Sep 18, 2012, at 4:44 AM, Johnny <vr2...@yahoo.com.hk> wrote: >> >>> Yes , correct , laptop supplies are often RF noisy. >>> >>> Sent from my iPhone 4 >>> >>> "Fred Townsend" <ftowns...@sbcglobal.net> 於 2012年9月18日 下午2:04 寫道： >>> >>>> Jeff, caution. Laptop power external supplies are designed to be followed >>>> by precision internal regulators that handle the logic voltages and >>>> charging >>>> the battery. The external supplies are not well regulated and can be quite >>>> noisy. They may not be the best supplies for ham rigs. >>>> 73 >>>> Fred, AE6QL >>>> >>>> -----Original Message----- >>>> From: elecraft-boun...@mailman.qth.net >>>> [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jeff Herr >>>> Sent: Monday, September 17, 2012 6:40 PM >>>> To: 'Elecraft Reflector' >>>> Subject: [Elecraft] laptop power supply to power KX3 >>>> >>>> While at work I went through our stock of power supplies for the various >>>> makes of laptops we use. >>>> I found that Toshiba supplies are specified 15v and ranged in current >>>> capability from 2.5 amps and up. >>>> >>>> Dell, Lenovo, HP, Acer, Asus all use 19v supplies. >>>> >>>> Those Toshiba supplies are very small. >>>> >>>> WW6L >>>> >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:Elecraft@mailman.qth.net >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:Elecraft@mailman.qth.net >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:Elecraft@mailman.qth.net >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
